Abstract
Abstract A new method is presented by which raindrop size spectra are determined from power spectra measured by an X-band Doppler radar. Prior to drop size spectrum calculation, bias caused by vertical wind, vw, is removed by an iterative process that uses a disdrometer-determined relation that is characteristic of the rainfall type. The specific relation (Z ≈ 507 R1.44) is determined from the best correlated data pair formed between Z or w with one of R, M, and vm. The vertical wind is estimated by shifting (rotating) the power spectrum along the velocity axis until this Z-R relation is satisfied. This method works for any shape of drop size spectrum. The power spectrum noise is studied by a computer simulation that indicates that smoothing of the spectra by a running average is not reliable for suppressing stochastic measurement noise. Consequently, a vertically pointing radar scanning strategy was designed to allow averaging of the power spectra prior to drop spectrum calculation. This scan was tested ...
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
